Using data samples of 983.0 fb(-1) and 427.9 fb(-1) accumulated with the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy e(+)e(-) colliders, singly Cabibbo-suppressed decays Xi(+)(c) -> pK(S)(0), Xi(+)(c) -> Lambda pi(+), and Xi(+)(c) -> Sigma(0)pi(+) are observed for the first time. The ratios of branching fractions of Xi(+)(c) -> pK(S)(0), Xi(+)(c) -> Lambda pi(+), and Xi(+)(c) -> Sigma(0)pi(+) relative to that of Xi(+)(c) -> Xi(-)pi(+)pi(+) are measured to beB(Xi(+)(c) -> pK(S)(0))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (2.47 +/- 0.16 +/- 0.07%),B(Xi(+)(c) -> Lambda pi(+))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (1.56 +/- 0.14 +/- 0.09%),B(Xi(+)(c) -> Sigma(0)pi(+))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (4.13 +/- 0.26 +/- 0.22)%.Multiplying these values by the branching fraction of the normalization channel, B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (2.9 +/- 1.3%, the absolute branching fractions are determined to beB(Xi(+)(c) -> pK(S)(0)) = (7.16 +/- 0.46 +/- 0.20 +/- 3.21) x 10(-4),B(Xi(+)(c) -> Lambda pi(+)) = (4.52 +/- 0.41 +/- 0.26 +/- 2.03) x 10(-4),B(Xi(+)(c) -> Sigma(0)pi(+)) = (1.20 +/- 0.08 +/- 0.07 +/- 0.54) x 10(-3).The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty in B(Xi(+)(c) -> Xi(-)pi(+)pi(+)).
Adachi, I., Aggarwal, L., Akopov, N., Alhakami, M., Aloisio, A., Althubiti, N., et al. (2025). Observations of the singly Cabibbo-suppressed decays $$ {\Xi}_c^{+}\to p{K}_S^0 $$, $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$, and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 2025(3), 0-19 [10.1007/jhep03(2025)061].
Observations of the singly Cabibbo-suppressed decays $$ {\Xi}_c^{+}\to p{K}_S^0 $$, $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$, and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ at Belle and Belle II
Branchini, P.Membro del Collaboration Group
;Budano, A.Membro del Collaboration Group
;Bussino, S.Membro del Collaboration Group
;De Pietro, G.Membro del Collaboration Group
;Laurenza, M.Membro del Collaboration Group
;Martellini, C.Membro del Collaboration Group
;
2025-01-01
Abstract
Using data samples of 983.0 fb(-1) and 427.9 fb(-1) accumulated with the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy e(+)e(-) colliders, singly Cabibbo-suppressed decays Xi(+)(c) -> pK(S)(0), Xi(+)(c) -> Lambda pi(+), and Xi(+)(c) -> Sigma(0)pi(+) are observed for the first time. The ratios of branching fractions of Xi(+)(c) -> pK(S)(0), Xi(+)(c) -> Lambda pi(+), and Xi(+)(c) -> Sigma(0)pi(+) relative to that of Xi(+)(c) -> Xi(-)pi(+)pi(+) are measured to beB(Xi(+)(c) -> pK(S)(0))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (2.47 +/- 0.16 +/- 0.07%),B(Xi(+)(c) -> Lambda pi(+))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (1.56 +/- 0.14 +/- 0.09%),B(Xi(+)(c) -> Sigma(0)pi(+))/B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (4.13 +/- 0.26 +/- 0.22)%.Multiplying these values by the branching fraction of the normalization channel, B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = (2.9 +/- 1.3%, the absolute branching fractions are determined to beB(Xi(+)(c) -> pK(S)(0)) = (7.16 +/- 0.46 +/- 0.20 +/- 3.21) x 10(-4),B(Xi(+)(c) -> Lambda pi(+)) = (4.52 +/- 0.41 +/- 0.26 +/- 2.03) x 10(-4),B(Xi(+)(c) -> Sigma(0)pi(+)) = (1.20 +/- 0.08 +/- 0.07 +/- 0.54) x 10(-3).The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty in B(Xi(+)(c) -> Xi(-)pi(+)pi(+)).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


